Athabasca GND64(1.8) filter has come on the market, with new reduced exposure grade, it is suitable for the environment of huge light difference such as sunrise. It is used to reduce the light difference between up and down or left and right. Then you can get more detailed and balanced image.ARK GND64 filter uses German Schott glass, with multi-ultrathin noble metal coating, it has the advantage of low reflection, and low color deviation. Also it adopts double-layer water repellent coating, it is very convenient at different occasions.